Improvement in spring-motors



G. UNDERHILLV. Spring-Motor.

' No. 196,503. Patented Oct. 23,1877.

WITNE ATTORNEYS N.FETER S. FHDTO-LITHOGRAPHER.WASHINGTON. D, C.

I f UNITED STATES PATENT. ,QFFIOE.

GILBERT UNDERHILL, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN SPRING-MOTORS.

Specification forming part of Letters Patent No. 196,503, dated October 23, 1877; application filed September 12, 1877.

To all whom it may concern:

Beit known that I, GILBERT UNDERHILL, of Philadelphia, in the county of Philadelphia, and in the State of Pennsylvania, have invented certain new and useful Improvements in Motors for Sewing-Machines; and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying dpawings, and to the letters of reference marked thereon, making a part of this specification.

The nature of my invention consists in the construction and arrangement of a motor for sewing-machines, as will be hereinafter more fully set forth. p

In order to enable others skilled in the art to which my invention appertains to make and use the same, I will now proceed to describe its construction and operation, referring to the annexed drawing, in which Figure 1 is a front view of my improved sewlngmachine motor. Fig. 2 is aside view of the same. Fig. 3 is a longitudinal section through the line or as, Fig. 2. Fig. 4 is a view of the brake.

A represents a framework of suitable construction to contain the various operating parts. In this frame are two shafts or arbors, a and 1), running parallel with each other. The shaft to is the finding-arbor, and runs entirely through the frame, while the shaft 1) runs only partially through the frame, and has the operating spring B wound around it, one end of said spring being secured to said shaft, while the other end is fastened to the frame. The winding-arbor a, passes for a portion of its length through a sleeve, (1, as shown, upon which sleeve are secured a pinion, D, and a large bevel-gear wheel, D.- At the rear end of the sleeve (1, and loosely upon the arbor a,

is placed a cog-wheel, E, connected to said arbor by a pawl, e, and ratchet-wheel f. The co gwheel E' meshes with a small cog wheel or pinion, G, secured upon a short arbor, h, upon which is also secured a larger cog wheel, G, and this meshes with the pinion D upon the sleeve 07, so that by these means a very rapid motion is imparted to the cogged periphery or rim of the wheel D from the shaft a. This bevel-gear wheel D meshes with a small bevelpinion, I, upon a short arbor, i, which arbor also carries the band-pulley H, so that thereby a still more rapid motion is imparted to the band-pulley. This pulley is to be, by a belt, connected with the band-wheel of the sewing-machine to which the motor is attached. On the shaft vlis further secured a collar or small wheel, m, under whichisplaced a curved brake-shoe, J, provided'with a stem, K. This stem is surrounded by a spring, a, which presses the brake up against the wheel .m to stop the motor. The stem or rod K is intended to be connected to a treadle or foot-lever to be operated by the foot, so as to withdraw the brake more or less from the wheel on, and thus start the motor, and also regulate the speed thereof.

The device for communicating motion from. the spring-arbor b to the winding-arbor a is as follows: Upon these .two arbors are secured two tapering or conical pulleys, L L, of the same size, but placed in opposite directions, and connected by a cord or chain, 10,-w0und around them. These pulleys, being of proper taper and of the same size, act as varying levers, and it will readily be seen that an equal force of the spring is obtained all the way.

It will be noticed that, by the arrangement of the gearing as described, the sleeve d and shaft to within it both rotate in the same direction, thus reducing friction.

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is-

1. The combination of the shaft to with gear E, the sleeve d surrounding said shaft, and provided with gears D D, and the idlegears G G, all arranged, as described, for increasing the speed and causing the shaft and sleeve to rotate in the same direction, as herein set-forth.

2. The combination of the winding-arbor a with gear E,,shaft b, coil-spring l3, conical or tapering pulleys L L, placed on the shafts a b in opposite directions, cord 12, sleeve d, with gears D D, and idle-gears G G, all constructed and arranged to operate substantial-- 1y as and for the purposes herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 31st day of August, 1877.

' GILBERT UNDERHILL.

Witnesses:

WILLIAM S. TOLAND, ELWooD A. GoLLrNs. 

